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(No Model.) 3 Sheets-Sheet 1 T..B. HEATHORN.

PROPELLER.

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(No Model.) 3 Sheets-Sheet '2.

T-.B.HEATHORN.

PROPELLER.

I B9. 510,970. Patented Dec. 19, 1893.

I INVENTOR:

1/213 Azzamey (N0 Mariel.) 3 Sheets-Sheet 3. T. B. HEATHORN. PROPELLERPatented Dec. 19, 1893.

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UNITED STATES PATENT Grmcs.

THOMAS BRIDGES HEATHORN, OF LONDON, ENGLAND.

P R'O P E L L E R SPECIFICATION forming part of Letters Patent No.510,970, dated December 19, 1893.

Application filed June 26, 1893. Serial No. 473,886. (No model.)

To aZZ whom it may concern.-

Beitknown that I, THOMAS BRIDGES HEATH- RN,a subject of the Queen ofGreat Britain and Ireland, residing at Wilton Place, Knightsbridge,London, in the county of Middlesex, England, have invented certain newand useful Improvements in Propellers for Boats, Aerial Vehicles and theLike; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same. i

This invention relates chiefly to the constructicn of propellers of thatclass in which the vessel is propelled and steered, orits motionretarded, by the action of a single vibrating stern paddle or rudder towhich is imparted a compound. motion comprising a primary oscillationabout the axis of the rudder post, due to the motor effort and asecondary oscillation about an independent axis in the rudder frame, dueto the turning or tilting of the rudder blade caused by the resistanceof the water or other medium when so oscillated about the rudder postaxis; and has for its object to insure the return of the propeller bladeto its normal position in the oscillating rudder frame after beingdisplaced by the aforesaid secondary oscillation, and to provide meansfor locking the rudder or propeller blade securely to the rudder post orframe when employed as a rudder only.

In the accompanying threesheets of illustrative drawings:Figure 1represents a side elevation of a propeller for boats and the likeconstructed according to this invention and Figs. 2, 3, and 4 representside elevations of modified arrangements of the same. Fig. 5 representsa sectional elevation of a screw propeller provided with myimprovements.

Referring to Fig. 1 the rudder propeller blade a is mounted in bearingsbin the oscillating rudder frame 0 secured to the stern postd by thepivots e, f and bearings g and is provided with a crank it oscillatingwith it and connected to a bar '21 by means of rings or bands Z of indiarubber or other suitable elastic material so that, as the rudder a isdisplaced from its central position in either direction, it is caused bythe said springs to return to its normal and central position as will bereadily understood. Rollers m, on

which the crank h is pressed and rolls, are mounted on the rod iandserve to reduce the frictional resistance to the motion of the rudderblade.

In order to lock the rudder blade aand the rudder frame 0 together andprevent their independent oscillation, when it is desired to use theblade at as a rudder only, a locking crank it is formed on the end ofthe rudder crank it capable of engaging with a block 0 sliding on aguide bar 19 and controlled from above by means of a connecting cord q.A suitable casing r is provided to inclose the working parts andpreserve them from injury.

Fig. 2 represents a similar arrangement to Fig. l the crank h and bolt71 being inverted as clearly shown.

In the modification shown in Fig. 3 the crank h is secured to the rudderframe, the propeller blade a being mounted thereon by bearings 19. Acamspivoted at t in the rudder frame, and controlled from above by the cordq, engages with the propeller blade when desired and looks it and therudder frame together.

Fig. 4 represents a similar arrangement to Fig. 3, the crank it and bolti being inverted.

In the arrange ment of screw propeller shown in Fig. 5 the bladeso areformed with cranks w, and connected together by a pin cc, and arereturned to their normal positions when displaced by elastic rings gwhich connect the cranks w and pinsz as will be readily understood.

What I claim, and desire to secure by Letters Patent, isr 1. Thecombination, with a frame for supporting a propeller blade, of apropeller blade journaled in the said frame, one of the said parts beingprovided with a crank and the other said part being provided with a bararranged parallel with the crank, and bands of elastic materialencircling the said crank and bar, whereby the propeller blade isrestored to its normal position, substantially as set forth. 7

2. The combination, with the stern post of a Vessel; of a frame pivotedthereto, and a propeller blade journaled in the said frame, one of thesaid parts being provided with a crank and the other said part beingprovided with a bar arranged parallel with the crank;

bands of elastic material encircling the said tractible locking deviceoperating to rigidly crank and bar, and a locking device for rigsecurethe propeller blade to the frame when idly securing the propeller bladein thefraine desired, substantially as set forth.

when desired, substantially as set forth. In testimony whereof Iaifix mysignature in 5 3. The cornbination, with the stern post, of presence oftwo witnesses.

the frame cplvoted to the stern post and pro- THOMAS BRIDGES HEATHORNvided with the bar '5, the propeller blade journaled in the said frameand provided with NVitnesses:

the crank it, bands of elastic material eneir- WILLIAM H. WHEATLEY, tocling the said bar 2' and crank h, and a re- ALBERT JONES.

